Frequency converter for an antenna



FIG. 1 is a front perspective view of a frequency converter for an antenna showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof, the bottom plan view being a mirror image;

FIG. 4 is a front elevational view thereof; the rear view being a mirror image;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a right side elevational view thereof. 

The ornamental design for a frequency converter for an antenna, as shown and described. 